inductor noise happens, even to some very expensive lights
it is not harmful
but I can live without it…
I hope you get a replacement that does not hum… it is not “supposed to” hum.
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the fastest way to get the correct email, is to begin the process of a Paypal dispute.
You do not have to file the dispute, just use the email contact that paypal shows when they suggest you contact the merchant first.
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Be prepared to post a video on Youtube, even if the hum is not obvious that way, the paper pushers may require it as part of procedure to cover their a, before replacing your light.
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hopefully Thrunite will just mail you a replacement (and let you keep the bad one)
or they might refund you, if you prefer, and let you keep the bad one.
their customer service script might require them to suggest you mail the bad one back, you should politely decline that expense, and offer them the opportunity to send you a prepaid label (they wont).
their scripted negotiation steps may also include lowballing you with a 25% credit, which after you decline, they raise to 50%… decline again, they get to full refund or replace
hopefully you wont need to get the full monte, and you will end up with a nice quiet light, plus a backup that hums